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Old 14th April 2011, 07:02 AM   #1
db! is offline db!  Canada
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Default TDA2030 "protection diodes"

I'm looking to build an amp with some TDA2030 chips and I'm wondering if the "protection diodes" are really needed. According to the datasheet, they're there to protect against "output voltage spikes" but all the other TDA20xx series chips don't seen to require them. Are they really necessary or can I simply do without them?

Any advice would be appreciated!

Last edited by db!; 14th April 2011 at 07:12 AM.
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Old 14th April 2011, 07:58 AM   #2
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if included in the data sheet I think you should put as for each IC must change values ​​of some components varies TDA2040/50 snubber network ...


PS: I am translating with google please forgive me if something is not understood
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Old 14th April 2011, 10:07 AM   #3
coresta is offline coresta  France
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Yes for sure you should put them , as any other solid state amp : I prefer shottkys but any cancel of loudspeaker's feedback is good to protect the final stage
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Old 14th April 2011, 11:27 AM   #4
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Cancel the diodes, this can have a try!
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Old 14th April 2011, 03:04 PM   #5
johnr66 is offline johnr66  United States
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Are you using the chip alone or as a driver for discreet devices (TDA2030A)?

What is your supply voltage? As a driver, or when using the chip at higher voltages, I'd add the diodes.

I'd also select the TDA2050 or LM1875 because they allow for higher output currents which means you can use higher Vs when used alone for more Po. They don't need the diodes as they are internal.
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Old 14th April 2011, 05:07 PM   #6
db! is offline db!  Canada
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Thanks for the replies guys!

The supply will be around +-17v. The chip is being used alone to drive speakers. The reason I'm using the TDA2030 is because I have a whole bunch of them.
Is there any real harm in eliminating the diodes?
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Old 14th April 2011, 05:38 PM   #7
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how eaily can you replace speakers is the only question.
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Old 14th April 2011, 07:01 PM   #8
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No you can eliminate the diodes if you have a bunch of TDA2030s spare.

All the diodes do is 'catch' any reactive output - i.e. it clamps the voltage swing possible at the amps output to the supply rails + (or -) about 0.7v, to protect the TDA2030 output stage. Overkill, really, but for the cost of two diodes very cheap insurance. They do not affect the amps measured or perceived performance.
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Old 15th April 2011, 10:24 AM   #9
AndrewT is offline AndrewT  Scotland
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One can also add diodes across the PSU to prevent excessive reverse charging of the capacitors.

These 4 diodes cost pennies or a few more cents. Very cheap insurance.
regards Andrew T.
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